We've already brought you rear-talking, but now MashMods are selling a conversion kit to give your N-Gage Classic a Hot Swappable MMC. It adds an MMC Holder to the rear of your case, and a fly cable inside going into the original MMC holder. Hopefully we'll have a kit to review in the near future.
Hot Swap MMC Modification for N-Gage Classic
I'm really hope too that N-Gage Classic have a Swappable MMC like N-Gage QD Hotswap.